Edward p



(No Model.)

E. P. JOHNSTON.

HEATING DRUM.

No. 428,756. Patented May 27, 1890.

UNITED STATES PATENT OFFICE.

EDWVARD P. JOHNSTON, OF WASHINGTON, DISTRICT OF COLUMBIA.

HEATING-DRUM.

SPECIFICATION forming part of Letters Patent No. 428,756, dated May 27, 1890.

Application filed February 12, 1889- $erial No. 299,564:- (No model.)

To all whom it may concern.-

Be it known that I, EDWARD P. JOHNSTON,

a citizen of the United States, residing at WVashin gton, in the District of Columbia, have invented new and useful Improvements in Heating-Drums, of which the following is a specification.

This invention relates to heating-drums; and it has for its object to provide a device of this class adapted to be used in connection with any stove, furnace, or other heating apparatus, and which shall be provided with convoluted passages for the transmission, respectively, of the products of combustion and a current of air,which lattershall thus be heated.

The invention consists in the improved construction and arrangement of parts to be hereinafter described, by means of which heatingsurfaces of relatively large extent shall be produced within a comparatively limited space, whereby a large percentage of the heat generated may be utilized, as will be hereinafter fully explained with reference to the drawings, in which-- Figure 1 is a vertical sectional view of a heating-drum embodying my improvements. Fig. 2 is a vertical section taken on the line 00 cc of Fig. 1. Fig. 3 is a horizontal sectional view.

The same letters refer to the same parts in all the figures.

A designates the shell or casing of the drum, which may be square or rectangular in crosssection, and the opposite sides of which E B are connected by means of a corrugated metallic sheet or plate 0, which extends longitudin ally through the casing, and the corrugations of which are of considerable depth, so as to form a series of chambers D and E, the openin gs of which face in opposite directions. The edges of the corrugated plate 0 are to be secured to the sides B of the casing in such a manner as to form a perfectly-tight joint. The opposite sides of the casing F and Gare each provided with a series of horizontalinwardlyprojecting deflectors or plates F G, extending into the chambers or compartments D and E, formed by the corrugated plate, but terminating at some distance from the inner ends of the said chambers, as will be clearly seen in Fig. 1 of the drawings, The deflectors may be sustained in position by supports g 9 as shown. The edges of the plates F G extend entirely to the sides 13 B of the casing, so as to cause the smoke and air to be deflected when passing through the casing, as will be presently described. The side G of the casing A, which is adjacent to the channel through which the products of combustion pass, is provided with a central longitudinal slide or hinged section G Fig. 3, Which may be opened or removed, in order that accumulations of soot or other obstructions may be readily removed from the interior of the casing whenever it shall be necessary.

It will be seen that the casingA is divided longitudinally by the corrugated plate 0 into two separate chambers or compartments H and I, each subdivided into the horizontal chambers D and E, into which the horizontal plates or deflectors extend from the opposite sides F G of the casing. The upper and lower ends of the casing are provided with suitable heads, both of which communicate with the longitudinal passage 1. These heads, which are designated by letter J, are preferably provided with cylindrical collars K, by means of which the device may be connected with stovepipe of ordinary construction. The ends of the longitudinal passage H are left open for the passage of a current of air.

To afford greater heating-surface and improve the appearance of the casing A, it may be, and is preferably, inclosed within an outer cylindrical shell or casing L, provided with perforated ends, either cone-shaped or horizontal, one or both of which ends should be detachable or pivoted at one edge, in order that the cylindrical. casing L may be temporarily removed when it is desired to relieve the drum A of soot or other obstruction. The casing L is supported in its normal position by a number of projections extending inwardly and resting upon the casing of the drum A; or it may be attached in any other convenient manner. The casing L is not, 110wever, necessary or essential to the successful operation of the drum A.

The operation and advantages of my invention will be readily understood from the foregoing description, taken in connection with the drawings hereto annexed. When the device is adjusted in its proper position, the products of combustion entering at one end of the casing will pass through the longitudinal passage I, the plates or deflectors G serving to force the said products of combustion to follow the convol u tions of the corrugated plate 0 and to pass entirely through each of the sub-chambers E, formed by the said corrugated plate. At the same time the current of air entering at the opposite side of the casing will be caused by the deflectors F to follow the convolutions ot' the corrugated plate (I, thus subjecting the current of air to direct contact with the entire heated surface of the said corrugated plate C, wherebythe temperature of the said air-current is gradually raised, so as to approximate to that of theproduets of combustion passingthrough the casing on the opposite side of the corrugated plate.

The general construction and arrangement of parts composing the device are, as will be seen, very simple, and by making the casing of a proper length a large percentage of the heat of the products of combustion may be utilized.

The device may easily be cleaned by opening the swinging door or section of the side G of the drum or casing, and it may be readily attached to an ordinary stove-pipe in position for operation, it being obvious that the products of combustion may be caused to enter either at the upper or the lower end of the casing, as may be preferred.

llaving thus described my invention, I claim and desire to secureby Letters Patent- As an improvement in heating-drums, the combination of acasing open at both ends, a single corrugated plate extending through the said casing, secured to the sides thereof, and dividing it vertically into two separate comparments having sub-compartments formed by the convolutions of said corrugated plate, the heads arranged at the upper and lower ends of one of the vertical divisions of the casing and having openings communicating with one of the said vertical divisions or compartments and provided with cylindrical collars, the horizontal deflecting-plates secured to opposite sides of: the casing and extending into the sub-compartments formed by the convolutions of the corrugated partition-plate, a door or hinged section communicating with the compartment of the casing having the heads or ends, and a detachable drum or shell having open ends, substantially as set forth.

In testimony that I claim the foregoing as my own I. have hereto allixed my signature in presence of two witnesses.

EIHYARI) l. .lOlINS'lON. itncsscs:

J, ll. Smenus, R. .T. MARSHALL. 

